release 0.7.2 (#66)

* Remove trailing / from metadata provider.

* Resolves issue #67
    - Before: 100 concurrent requests → 300+ refresh attempts → OOM
    - After: 100 concurrent requests → 1 refresh attempt → Stable memory

Added following changes:
    - Introduced a refresh coordinator to manage concurrent refresh requests
    - Implemented a test to simulate high concurrency and verify memory stability

* Issue #67 fixed.

session/chunking/chunk_manager.go

@@ -34,6 +34,11 @@ var (
 	globalMaxSessions  int64 = 5000 // CRITICAL FIX: Global limit of 5000 total sessions
 )
 
+// ResetGlobalSessionCounters resets global session tracking for testing
+func ResetGlobalSessionCounters() {
+	atomic.StoreInt64(&globalSessionCount, 0)
+}
+
 // Predefined configurations for each token type
 var (
 	AccessTokenConfig = TokenConfig{